/*
MIT License

Copyright (c) 2007 Ralf Kornmann

All right reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
*/

#pragma once

class CHost;

class CFunctionHook : public IUAHHockedFunction
{
	public:
		CFunctionHook (CHost& rHost, LPCWSTR strModule, LPCSTR strProc, DWORD Flags, FARPROC TargetProc);
		virtual ~CFunctionHook ();

        virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, void **ppvObject);
        virtual ULONG STDMETHODCALLTYPE AddRef( void);
        virtual ULONG STDMETHODCALLTYPE Release( void);

		virtual BOOL STDMETHODCALLTYPE IsHooked ();
		virtual FARPROC STDMETHODCALLTYPE GetProc ();

		const std::wstring& GetModuleName () const;
		const std::string& GetProcName () const;

		void UpdateState (HMODULE hModule, FARPROC proc);

	protected:
		CHost& m_rHost; 
		LONG m_RefCount;
		bool m_IsHooked;

		std::wstring m_strModule;
		std::string m_strProc;
		DWORD m_Flags;
		FARPROC m_TargetProc;

		HMODULE m_hModule;
		FARPROC m_OrgProc;

		DWORD m_OrginalCodeSize;
		BYTE* m_pOriginalCode;

		FARPROC m_PatchProc;

		void HookFunction ();
		bool CalculateCopySize (DWORD& rOrgSize, DWORD& rNeedSize);
		bool RedirectCall (FARPROC Org, FARPROC Dest);
		bool CopyCode (BYTE* pSourceCode, BYTE* pDestCode);

		void UnhookFunction ();
};